lol, I'm no math whiz, but I dont think $149 is a 9100% price increase over $49. But any way, its pretty crazy to think that the price of the forum software wouldn't increase over the years, profit/revenue isn't a bad thing, and the price of everything else has increased in those years (Though, i doubt by 9100% :D)
Also, a lot of the complaints/concerns in the thread seem like they aren't really viable to blame on invision? Modifications are provided via 3rd parties, and those are the people you want to talk about with having them upgraded/maintained.